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<blockquote data-quote="WayneF" data-source="post: 342643" data-attributes="member: 12496">Not for me.&nbsp;&nbsp; The white lens cap is just an averaging filter.&nbsp; It sees the scene as one resulting averaged color, and to use for WB, it assumes that color ought to be neutral gray (whether it is or not).&nbsp; But aim it into a green lawn or a blue sky, and it will be instead be green or blue, not neutral at all. The light is just whatever color it is, it certainly is no fixed standard. It simply cannot be more accurate than the cameras auto WB (i.e., not accurate, in general).Whereas a white card that you photograph (in the same light as the scene), is actually manufactured to actually be a neutral color, no color cast, and this works perfectly. We could use a close photo of the card for Custom WB Preset, but probably easier to do in post processing, which is trivial if Raw.Edit: Yes, I am aware the lens cap should be aimed at the light source, but there's so many times that is not possible (shade, etc).</blockquote>

[QUOTE="WayneF, post: 342643, member: 12496"] Not for me. The white lens cap is just an averaging filter. It sees the scene as one resulting averaged color, and to use for WB, it assumes that color ought to be neutral gray (whether it is or not). But aim it into a green lawn or a blue sky, and it will be instead be green or blue, not neutral at all. The light is just whatever color it is, it certainly is no fixed standard. It simply cannot be more accurate than the cameras auto WB (i.e., not accurate, in general). Whereas a white card that you photograph (in the same light as the scene), is actually manufactured to actually be a neutral color, no color cast, and this works perfectly. We could use a close photo of the card for Custom WB Preset, but probably easier to do in post processing, which is trivial if Raw. Edit: Yes, I am aware the lens cap should be aimed at the light source, but there's so many times that is not possible (shade, etc). [/QUOTE]

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